The Western Digital WD Blue 4TB Internal Desktop Hard Drive is a reliable and high-capacity storage solution for PCs. With a 3.5-inch form factor and SATA III interface, this HDD is compatible with a wide range of desktop computers. The drive operates at a rotation speed of 5400 RPM, ensuring fast data transfer and access. This WD Blue unit from Western Digital is perfect for expanding storage capacity in your computer system with a storage format of HDD only.